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C. B. KNOTT.

ROLL FILM CAMERA ATTACHMENT.

' APPLICATION FILED FEB. 23| IQIG- 1,317,085. Patented 23, 1919.

2 SH -SHEET l.

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C. B. KNOTTK. ROLL HLM CAMERA ATTACHMENT.

APPLICATION FILED FEB. 23.19l6. 1,317,085. Patented sept. 23, 1919.

2 SHEETSSHEET 2.

CLARENCE B. `KNOTT, 0F NEW YORK, N; Y.

ROLL-EILM-,GAMERA ATTACHMENT.

Specicationof Letters Patent.

Patentedept. 23,1919.

Application filed Fbruary-23, 1916. Serial No. 79,892.

To allwhom it may concern.'

Be it known that I, CLARENCE B. KNOTT, a citizen of the United States, residing at New York city, in the county of New York and Stateof New York, have invented certain vnew and yuseful Improvements in Roll- Film-Camera Attachments, of which the following is a speciication.

My invention .relates to improvements in roll .filmy cameras, and appertains more particularly to that type of camera which Vuses the ordinary commercial roll of six or twelve exposures, but is equally applicable to anynumber of ,exposures in a film.`

In the present form of camera, no .provision is made for developing one or two films out of a roll without developingthe entire roll. It is the object-of my lpresent invention to provide means for permitting such development withoutexposing or otherwise injuring the unused films. This feature is a very desirable .one from many stand-points, such as,

(a) Permitting a person to become acquainted with 'his film by `development :of one-or two exposures at a time;

(jb) Increasing the efficiency by permitting the development immediately after exposure, thereby permittingone to ymake another exposure to correct `an errorin position or time' or light,etc., when perhaps a week klater conditions would have changed.

Withthe ordinary type of camera, .itmay be necessary to wait a week or perhaps even a month-or so before the remainder of the film will `have been exposed, so that the entire roll can be developed.

For'this and many other similar reasons, my present invention has been evolved.

. It consists `primarily in means for cutting the film at any desired point; in the provision kofla light-,tight spring-curtain for preventing the unrolling of the film on-1the spool; and, further, of attachments to be made tothe end of the severed portions of the film, whereby to permit of rollingV up .each portion upon a spool. These attachments supplementarily -extend the protecting paper ribbon of the exposed iilm to properly protect same on the spool or roll, and furnish the unexposed section with a supplementary section of ypaper ribbon to properly connect it with the substituted spool.

In .the accompanyingdrawings Figurel, is a perspective view kof the winding-ofl'-end .of the camera;

Fig. 2, is a vertical section on the line 2 2 of Fig. l;

Fig. 3, `is a rear view with-theupper portion of the camera removed, .disclosing 1.the film as having kbeen severed;

Fig. l is a ydetail*perspective view `of .the light-proof curtain;

Fig-. 5 is a detail perspective ofthe :supplementary 'tab' shown as=engaging the '.SV? ered film;

Fig. 6, is a detail `section .showing the. severed film; supplemental tab and the clampingmeans attached lin connection with a receiving reel;

Fig. 7 is a detail elevationof thewsupplementary tab and clamping means;

Fig. 8, is an edge view of Fiig. 7';

Fig. 9, is a horizontal:section-.through the upper portiony of thecamera showing amodified form of cutting'means.

To the camera `casing l is attaQhQd .a fremovable back, which is made ofwthe sections 2 and 3. The section Q is fastened by `the usual snap-catches 3f, 3'., and I may lalso provide the pivoted lugs .4, 4. The 'upper section 3 is. provided 'with fasteningiclips 4', 4, and with a metallic yelongggation, which forms a light-tight joint with the section2. This joint is in the vproper .place so .as to not disturb the-'section of film ready to be exposed. This .elongated portion .contains in the upper part-a light-proof slot 7 extending across and through the back so that the film and vpaper l ribbons may besevl ered in the proper place :to preserve lighttight both the exposed and the 4unexposed sections of the film.

A knife-point yor otherk sharp instrument may be lused throughthe vslot 7 ,to sever` the film and its paper ribbons, but I prefer to use a cord or :string 10 or such like device which is attached to `oneiside of the. spoolchamber as at S rand l.brought .across the chamber and passed througha loop or eyelet in the rod `9. As V,shown .in the modified view of Fig. 9, a straight `or curved lade l0 may be rused which is attached CIJ CII

as at 8 to the end of the spool-chamber having its outer free end fastened to the eyelet of rod 9, whereby it is pulled out- Wardly, thereby acting in a similar manner as the string 10.

It will be apparent that with the film and the paper ribbons stretched as they are bctween the spools, as usual in a camera, one may by pulling the cord or blade 1f) from one end of the slot 7 to the other end, sever all evenlu and quickly at one pull.

The rod 9 is provided on the under surface with the longitudinal projection 11 adapted to be received in the slot 7 to render it absolutely light-proof. The rod 9 is kept in position by means of the sliding lock 12.

About the upper spool, which is the one directly actuated manually by the operator, I pass the light-tight curtain 13. This is made of gossamer or plush or velvet or leather, etc., or any combination of those materials. l provide a strip of plush 13 on each edge for an additional safeguard against light. One end of this curtain tere minates in a stiff rod 111, which is removably received in thev slots 15 in the Walls of the spool-chamber. fr constant tension is kept on the curtain 13 by a spring-roller 1f).

The ratchet on the receiving spool or roll of cameras, and the friction of the runway, together With retarding springs against the feed spool, keep the film tight when the film strip or ribbon is properly ins walled and the camera in proper operation. odern films of all makes are so stiff and springy that if the film and paper ribbons are severed they unwind on the roll or spool, like a released coil-spring, making it impossible When so unWound to remove the camera back Without light-striking or fogging more or less of the so unWound sensitive film. The light-proof curtain 13 overcomes this possibility of fogging due to the constant tension which it keeps on the receiving spool 19. y

The operation of the invention thus far described is simple. Vvfhen it is desired to sever the exposed from the unexposed section of a film, the rod 9 is loosened from the light-proof slot 7 and is given a sharp upward pull, causing the knife or string 10 to sever the film and its paper ribbons all the Way across, as previously noted. Then the back 3 is removed, exposing` the severed ends 27 of the film 17. To the end 18 of the film 17 on the receiving spool 19 is att-ached one of the supplementary tabs 20. This tab 20 consists of a strip of black paper or other like flexible material, which is provided With the .7l-shaped nie1nber 21, preferably made of a fairly stiff metal. The paper 2O is received in a fold of the metal 21, as shovvn in Fig. 8. The upper fold 22 of this strip 21 is provided with downwardly projecting points 23, which are positioned above the punched holes 24 adapted to receive them. This metal strip 21 is adapted to be fastened to the ends of the film and paper ribbons by pushing the projecting points 2S down through the film and paper ribbons and through the holes 2l, where they may be turned over and clenched, if necessary.

By this means a grip is obtained upon the film and its attendant paper ribbons, which is not possible if the supplementary tab were merely pasted on, as I believe has been at* tempted. This is because there areusually th 1ee thicknesses of material, and with a tab merely glued, it is impossible to hold the middle ribbon.

Immediately upon the attachment of the strip 20 to the end 18, the receivingr spool is actuated in the usual manner, and the spool is Wound up, the black tab l2() making the complete roll light-proof. This is rendered much more eiiicient and certain in its action by the light-tight tension curtain 13. The end of the supplementary tab 20 is provided with the usual niucilaged end 25, whereby to paste the roll to prevent its unwinding.

After the removal of the spool, a spare spool is put in place, and another tab is clamped, in the same manner as the former one, to the end 27 of the film 17. The opposite end 25 of tab 20 is inserted in the new spool, and after taking up the slack on the spool, the film is Wound around as in the usual manner.

I claim:

1. In a camera, the combination With a back having a slot, cutting means pivotally mounted beneath the back in close proximity to the slot, and a rod connected to said cuttingmeans and adapted to be inserted in said slot to exclude light.

2. 1n a camera using a film, the combination With a back having a' movable section, and a covering means for the exposed portion of the film, of cutting means extending into the caniiera adapted to sever the film for the purpose of removing the exposed portion of the film, and a supplementary detachable tab having fastening means adapted to embrace the severed ends of the unexposed portion of the film, whereby the latter may be Wound up.

3. 1n a roll film camera having a movable back section, means Within the camera for severing the film while in the camera for the purpose of removing a section thereof, ai detachable supplementary tab having means which pierce the layers of the remaining film, the outer free end of said tab adapted to be connected to the Winding-up spool, and a flexible light-proof fabric Vbeneath which the severed portion of the film and its supplementary tab is Wound.

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4. In a roll lm camera having a removable back section, means extending in the camera for severing the film While in the camera, whereby a portion thereof may be removed, a tab for the severed ends of the remaining film, and means Within the camera for receiving the free end of said tab.

5. A roll film camera having a back consisting of movable and immovable sections,

the immovable section having a slot thereacross, means for severing the iilm and its ribbons While in the camera extending through the slot, detachable supplementary tabs adapted to engage each layer of the film and its ribbons, a spool, a light-tight tension Copies ot this patent may be obtained for ive cents each, by addressing the Commissioner of Patents, Y

curtain tightened about said spool, between which spool and curtain the severed portion of' the film and the supplementary' tabs attached thereto are Wound.

6. In a roll film camera, an attachment for films comprising a flexible Strip With penetrating clamping means at one end thereof, adapted to receive one end of the flexible strip and the layers of the severed film in such a manner that they overlap, the penetrating means passing completely through 'the overlapped ends of the flexible strip and layers of film and clenched.

In testimony whereof I aiiiX my signature.

CLARENCE B. KNOTT.

Washington, D. C. 

